Following Columbia’s
on-time launch from the Kennedy Space Center this morning, flight controllers
in Mission Control noticed a degraded flow rate in one of two freon
cooling loops that help to dissipate heat from the orbiter.

There are two freon
cooling loops that are part of the shuttle’s active thermal control
system, one on the port and one on the starboard side of the payload
bay. Freon loop 1 on the port side is showing a degraded flow rate.

While low, the
flow rate is slightly above flight rule limits. Mission managers are
currently reviewing the flight data and studying the past performance
of the sensors that measure the flow rate of the freon through the loops
to build confidence in the performance of the freon loop and its ability
to support the STS-109 mission through completion.

After reaching
orbit this morning, Commander Scott Altman and Pilot Duane Carey commanded
the first in a series of engine firings to position Columbia for its
Sunday morning rendezvous with the Hubble Space Telescope. Their crew
mates – Mission Specialists John Grunsfeld, Mike Massimino, Nancy Currie, Jim Newman and Rick Linnehan – began readying Columbia for its on-orbit
operations by stowing away their launch and entry suits and opening
the interior hatch to Columbia’s airlock.

This is Columbia’s
first flight since July 1999, following an extensive modification period
in which many of its systems were replaced or enhanced. Columbia was
NASA’s first shuttle orbiter and flew for the first time in April 1981.

The next status
report will be issued following the crew’s scheduled wake-up call at
8:22 p.m., or as events warrant.

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